public GroupedValueSequence(
GroupSpec groupSpecs[], int size, Sequence keySequence, XQueryContext aContext) {
this.groupSpecs = groupSpecs;
this.items = new Entry[size];
this.groupKey = keySequence;
// this.context = aContext; //UNDERSTAND: do we need context here??? -shabanovd
this.groupKeyLength = groupKey.getItemCount();
}
public Entry(Item item) throws XPathException {
this.item = item;
values = new AtomicValue[groupSpecs.length];
for (int i = 0; i < groupSpecs.length; i++) {
final Sequence seq = groupSpecs[i].getGroupExpression().eval(null);
values[i] = AtomicValue.EMPTY_VALUE;
// TODO : get rid of getLength()
if (seq.hasOne()) {
values[i] = seq.itemAt(0).atomize();
} else if (seq.hasMany()) {
throw new XPathException(
"expected a single value for group by expression "
+ ExpressionDumper.dump(groupSpecs[i].getGroupExpression())
+ " ; found: "
+ seq.getItemCount());
}
}
}
/*
* (non-Javadoc)
*
* @see org.exist.xquery.BasicFunction#eval(org.exist.xquery.value.Sequence[],
* org.exist.xquery.value.Sequence)
*/
public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
if (context.getProfiler().isEnabled()) {
context.getProfiler().start(this);
context
.getProfiler()
.message(
this,
Profiler.DEPENDENCIES,
"DEPENDENCIES",
Dependency.getDependenciesName(this.getDependencies()));
if (contextSequence != null)
context
.getProfiler()
.message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);
if (contextItem != null)
context
.getProfiler()
.message(this, Profiler.START_SEQUENCES, "CONTEXT ITEM", contextItem.toSequence());
}
Expression arg1 = getArgument(0);
Sequence s1 = arg1.eval(contextSequence, contextItem);
Expression arg2 = getArgument(1);
context.pushDocumentContext();
Sequence s2 = arg2.eval(contextSequence, contextItem);
context.popDocumentContext();
if (s1.isEmpty()) {
return BooleanValue.valueOf(s2.isEmpty());
} else if (s2.isEmpty()) {
return BooleanValue.valueOf(s1.isEmpty());
}
Sequence result = null;
StringBuffer v1 = new StringBuffer();
StringBuffer v2 = new StringBuffer();
try {
if (s1.hasMany()) {
for (int i = 0; i < s1.getItemCount(); i++) {
v1.append(serialize((NodeValue) s1.itemAt(i)));
}
} else {
v1.append(serialize((NodeValue) s1.itemAt(0)));
}
if (s2.hasMany()) {
for (int i = 0; i < s2.getItemCount(); i++) {
v2.append(serialize((NodeValue) s2.itemAt(i)));
}
} else {
v2.append(serialize((NodeValue) s2.itemAt(0)));
}
Diff d = new Diff(v1.toString(), v2.toString());
boolean identical = d.identical();
if (!identical) {
logger.warn("Diff result: " + d.toString());
}
result = new BooleanValue(identical);
} catch (Exception e) {
throw new XPathException(
this,
"An exception occurred while serializing node " + "for comparison: " + e.getMessage(),
e);
}
if (context.getProfiler().isEnabled()) context.getProfiler().end(this, "", result);
return result;
}